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首页> 外文期刊>Limnology >Biotic and abiotic methane releases from Lake Biwa sediment slurry
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Biotic and abiotic methane releases from Lake Biwa sediment slurry

机译：琵琶湖沉积物浆液中的生物和非生物甲烷排放

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摘要

To determine the rate and mechanism of CH, production in Lake Biwa sediment, slurry was prepared and incubated. Surface sediment (sed) slurry (1.5-6cm) showed a CH4 release rate (4.9-9.5nmolg-dry-sed(-1) day(-1)) higher than that observed in the 5(-1) to 10(-1)cm sediment slurry (0.22nmolg-dry-sed(-1) day(-1)). Methane release from the surface (1.5-6cm) sediment slurry was biotic and was inhibited by addition of 2-bromoethanesulfonate (BES, an inhibitor of CH, production), whereas that from 5- to 10-cm sediment slurry was abiotic. The addition of BES, HNO3, and O-2 showed no effect on the CH4 release rate from the 5- to 10-cm sediment slurry. In addition, tracers ((NaHCO3)-C-13, 13 CH,COONa) were not incorporated into the released CH4 However, delta(13)C of CH4 released from the 5- to 10-cm sediment slurry (-74.0 +/- 0.6%.) indicated that this CH4 was produced by bacterial metabolism in the past, stored by adsorption on the surface of clay minerals in the sediment, and then released abiotically by desorption from the sediment slurry as a result of a decrease in hydraulic pressure and CH4 concentration in the pore water. This CH4 stored by adsorption could be extracted by autoclaving. In the sediment below 5cm, bacterial activity for CH4 production ceased, possibly because of the limitated availability of H-2 To clarify the mechanism of CH4 production in the sedi- ment, biotic CH4 production and the abiotic CH4 release found here should be estimated separately.
机译：为了确定在琵琶湖沉积物中产生CH的速率和机理，制备了浆液并进行了温育。表层沉积物（sed）浆液（1.5-6cm）的CH4释放速率（4.9-9.5nmolg-干-sed（-1）day（-1））比5（-1）至10（- 1）cm泥浆（0.22nmolg-干-sed（-1）天（-1））。从表面（1.5-6厘米）沉积物淤浆中释放的甲烷是生物性的，并通过添加2-溴乙烷磺酸盐（BES，CH的生成抑制剂）来抑制，而从5到10厘米沉积物淤浆中的甲烷是非生物性的。 BES，HNO3和O-2的添加对5到10厘米沉积泥浆中CH4的释放速率没有影响。此外，示踪剂（（NaHCO3）-C-13，13 CH，COONa）未合并到释放的CH4中，但是，CH4从5到10厘米沉积泥浆中释放的δ（13）C（-74.0 + / -0.6％。）表示该CH4过去是由细菌代谢产生的，通过吸附沉积在沉积物中粘土矿物表面上而存储，然后由于水压降低而从沉积物泥浆中解吸而非生物释放。和孔隙水中的CH4浓度。吸附储存的CH4可以通过高压灭菌法提取。在5cm以下的沉积物中，可能由于H-2的可用性有限而停止了CH4产生的细菌活性。为弄清沉积物中CH4的产生机理，应分别估算此处发现的生物CH4的产生和非生物CH4的释放。 。

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